242 MEMOIRS OF THE CARNEGIE MUSEUM 
Head 4.5; depth 6.6; D. 1.6; A. 12; eye 3.33 in the head, interorbital 5.5; 
center of eye a little behind the middle of the head; adipose 3.5 in the length. 
Maxillary barbel extending to middle of adipose on one side, to near its end on 
the other. Distance between snout and dorsal fulerum 3.2 in the length; dorsal 
spine a little more than snout and eye. Pectoral spine very little longer than 
dorsal spine, with 16-18 recurved teeth on about the basal three-fourths of the 
posterior face of the spine. Anterior face with 4 hooks near the tip and about 
40 short teeth along the rest of the spine. Humeral spine extending considerably 
beyond the middle of the pectoral spine. Lower caudal lobe longer than the 
head. Occipital process of the same width throughout, its width 3 in the length. 
A narrow, dark, lateral band; dorsal without a light band. 
11. Pimelodella cyanostigma (Cope). 
Rhamdia cyanostigma Corr, Proc. Am. Phil. Soc., 1870, p. 569 (Pebas) ; EIGENMANN 
& EIGENMANN, Occasional Papers Cal. Acad. Sci., I, 1891, p. 164. 
Pimelodus cyanostigma Corr, Proc. Am. Phil. Soc., 1878, p. 675. 
Pimelodella cyanostigma FowuER, Proc. Acad. Nat. Sci. Phila., 1915, p. 218. (Note 
on the relationship.) 
Habitat—Marafion Basin. 
Known only from the types. A specimen in the Field Museum, originally 
about 65 mm. long, collected by Anderson and Becker at Boa Vista, Serra da Lua, 
Feb., 1913, may belong to this species. The pectoral spines have been broken off, 
and a definite identification is impossible. 
12. Pimelodella megalops Eigenmann. 
Pimelodella megalops K1GENMANN, Repts. Princeton Univ. Exp. Patagonia, III, 
1910, p. 389; Mem. Carnegie Mus., Vol. V, 1912, p. 169, plate XV, fig. 2 
Habitat—Near mouth of the Potaro River, British Guiana. 
13. Pimelodella brasiliensis (Steindachner). 
Pimelodus (Pseudorhamdia) brasiliensis STEINDACHNER, Sb. Ak. Wiss. Wien, 
LXXIV, 1876, Siisswasserf. Siiddstl. Bras., III, p. 50, pl. VII (Rio Parahyba). 
Pimelodella brasiliensis EtGENMANN & EIGENMANN, Proc. Cal. Acad. Sci., (2), I, 
1888, p. 133; Occasional Papers Cal. Acad. Sci., I, 1890, p. 162; Proc. U. S. 
Nat. Mus., XIV, 1891, p. 29; Eraenmann, Reports Princeton Univ. Exped. 
Patagonia, IIT, 1910, p. 389. 
Rhamdia brasiliensis Rrpeiro, Fauna Bras., Peixes, IV, 1912, p. 275. Known only 
by the types from the Rio Parahyba. 
